Re: ConceptScheme as a subset of another?

Dear Antoine

Thanks very much.  That's extremely informative.

My thinking has moved on a little and I would appreciate any thoughts you
have on a slightly different approach. I'm on rocky ground here as my
background is more OO and I have very little background knowledge of RDF.

Essentially subsets are of _like_ things.  So two example ConceptSchemes
with subsets might be:

   - A ConceptScheme of Services with subsets of Fire and of Police services
   - A ConceptScheme of Needs with subsets of safety needs and of health
   needs

Hence I wonder if I should be creating a ex:ServiceClass as an
rdfs:subClassOf skos:Concept (and likewise for a NeedClass) and somehow
limiting the Service ConceptScheme to holding just ServiceClass concepts
(and likewise a Need ConceptScheme to just NeedClass concepts).

There will be a relationship between Service and Need concepts as defined by
a property like ex:addressesNeed.  I'm unsure if such a relationship should
be a rdfs:subProperty of a skos mapping or not.

Lots of issues there.  Any pointers would be welcome.

Many thanks
Mike


On Wed, Jul 15, 2009 at 13:36, Antoine Isaac <aisaac@few.vu.nl> wrote:

> Dear Mike,
>
> Sorry for the delay. To answer your specific questions:
>
>
>  I understand that the skos:inScheme property can be used to say a concept
>> is in a particular ConceptScheme and this can be used many times to say the
>> same concept is in many schemes.
>>
>
>
> Exact.
>
>
>  I can't say that one ConceptScheme is in another can I?
>>
>
>
> You cannot say this, at least using the SKOS model or another standard
> Semantic Web vocabulary. See [1].
> We have discussed that in the WG, but the requirement was not clear enough
> at the time.
> The only standard way is really to have your concept belonging to several
> schemes at a same time.
>
>
>  Is there any sensible way I can support these subsets?
>>
>
>
> Now, you could still create your own property to represent scheme
> inclusion, and equip it with semantics that help you implement the multiple
> inScheme statement trick.
> With OWL 2, this is doable:
> 1. you can introduce, say, an ex:subScheme property
> 2. you can define a property chain axiom [2] that combines it with
> skos:inScheme: [] rdfs:subPropertyOf skos:inScheme; owl:propertyChainAxiom
> (skos:inScheme ex:subScheme ).
>
> With this, if A is a sub-scheme of B, whenever you have c1 skos:inScheme A,
> then you would also have c1 skos:inScheme B if you use an appropriate
> reasoner.
> But of course this solution is not guaranteed to work well when others
> consume data that you wouldn't have "completed" youself beforehand, as it
> would rely on an adhoc property...
>
> Cheers,
>
> Antoine
>
> [1] http://www.w3.org/TR/skos-primer/#secextension
> [2] http://www.w3.org/TR/owl2-new-features/#F8:_Property_Chain_Inclusion
>
>
>
>>
>> ------------------------------------------------------------------------
>>
>> *Van:* public-esw-thes-request@w3.org [mailto:
>> public-esw-thes-request@w3.org] *Namens *Mike Thacker
>> *Verzonden:* dinsdag 30 juni 2009 18:25
>> *Aan:* SKOS
>> *Onderwerp:* ConceptScheme as a subset of another?
>>
>>
>> Hello
>>
>> I'm getting my head around SKOS with a view to seeing how well we can
>> represent UK public sector vocabularies hosted by esd.org.uk <
>> http://esd.org.uk> in SKOS and derive online viewers and other human and
>> machine readable resources from the RDF.
>>
>> My initial question relates to whether or not SKOS supports what esd knows
>> as "subsets".  For example these two online viewers:
>>
>>    * Subject vocabulary: http://www.esd.org.uk/standards/ipsv/viewer/
>>    * Service vocabulary: http://www.esd.org.uk/standards/lgsl/viewer/
>>
>> both feature drop down lists towards the top left of the page.  >From the
>> drop-down list you can select a named "subset" which contains some of the
>> concepts from the main list (eg you can limit UK local government services
>> to those delivered in Scotland).
>>
>> I understand that the skos:inScheme property can be used to say a concept
>> is in a particular ConceptScheme and this can be used many times to say the
>> same concept is in many schemes.  I can't say that one ConceptScheme is in
>> another can I?
>>
>> Is there any sensible way I can support these subsets?
>>
>> Thanks in advance
>> Mike
>>
>>
>